Index: DGDefs.h
===================================================================
diff -u -r045a37bbd6fda1cbe7c77e806bae3fc46c129f0d -r43adad09f3653207af77d46345e71fcdc007abca
--- DGDefs.h	(.../DGDefs.h)	(revision 045a37bbd6fda1cbe7c77e806bae3fc46c129f0d)
+++ DGDefs.h	(.../DGDefs.h)	(revision 43adad09f3653207af77d46345e71fcdc007abca)
@@ -187,8 +187,16 @@
 /// Enumeration of heat disinfection mode states.
 enum DG_Heat_States
 {
-    DG_HEAT_DISINFECT_STATE_START = 0,                  ///< Start heat disinfect mode state.
-    NUM_OF_DG_HEAT_DISINFECT_STATES                     ///< Number of heat disinfect mode states.
+    DG_HEAT_DISINFECT_STATE_START = 0,                      ///< Heat disinfect, start mode state
+    DG_HEAT_DISINFECT_STATE_EVACUATE_DIALYSATE,             ///< Heat disinfect, evacuate dialysate state
+    DG_HEAT_DISINFECT_STATE_FILL_WITH_WATER,                ///< Heat disinfect, fill with water state
+    DG_HEAT_DISINFECT_STATE_HEAT_WATER,                     ///< Heat disinfect, heater the stored water
+    DG_HEAT_DISINFECT_STATE_DISINFECT_RECIRC_PATH,          ///< Heat disinfect, heat disinfect recirculation path
+    DG_HEAT_DISINFECT_STATE_DISINFECT_RESERVOIR_1_TO_2,     ///< Heat disinfect, heat disinfect reservoir 1 to 2
+    DG_HEAT_DISINFECT_STATE_DISINFECT_RESERVOIR_2_TO_1,     ///< Heat disinfect, heat disinfect reservoir 2 to 1
+    DG_HEAT_DISINFECT_STATE_DISINFECT_DRAIN_PATH,           ///< Heat disinfect, heat disinfect drain path
+    DG_HEAT_DISINFECT_STATE_DEPRIME_RESERVOIRS,             ///< Heat disinfect, de-prime the reservoirs
+    NUM_OF_DG_HEAT_DISINFECT_STATES                         ///< Number of heat disinfect mode states.
 };
 typedef enum DG_Heat_States DG_HEAT_DISINFECT_STATE_T;
 
Index: MsgDefs.h
===================================================================
diff -u -r4a08b0816b48374da2c87dbe7d6d51e08ef6b81f -r43adad09f3653207af77d46345e71fcdc007abca
--- MsgDefs.h	(.../MsgDefs.h)	(revision 4a08b0816b48374da2c87dbe7d6d51e08ef6b81f)
+++ MsgDefs.h	(.../MsgDefs.h)	(revision 43adad09f3653207af77d46345e71fcdc007abca)
@@ -69,6 +69,7 @@
     MSG_ID_DG_HEATERS_DATA = 0x2C,                                      ///< DG broadcast of the heaters data
     MSG_ID_DG_TEMPERATURE_DATA = 0x2D,                                  ///< DG broadcast of the temperature sensors data
     MSG_ID_USER_UF_SETTINGS_CHANGE_CONFIRMATION_RESPONSE = 0x2E,        ///< HD response to user selection of ultrafiltration settings change option selection.
+    MSG_ID_DG_START_STOP_HEAT_DISINFECT = 0x2F,                         ///< HD request to start or stop DG heat disinfection.
 #ifdef EMC_TEST_BUILD
     MSG_ID_CAN_ERROR_COUNT = 0x999,  // test code in support of EMC testing
 #endif